2 layers of caching: 1. a configurable cache per URL that defaults to 5-minutes (can be disabled or increased up to 1 month) 2. and non-configurable http cach

2 layers of caching: 1. a configurable cache per URL that defaults to 5-minutes (can be disabled or increased up to 1 month) 2. and non-configurable http caching within chrome (cache-control headers), but since the cluster is auto-scaled, this cache naturally purges every few hours.